| Name | CVE-2019-12290 |
| Description | GNU libidn2 before 2.2.0 fails to perform the roundtrip checks specified in RFC3490 Section 4.2 when converting A-labels to U-labels. This makes it possible in some circumstances for one domain to impersonate another. By creating a malicious domain that matches a target domain except for the inclusion of certain punycoded Unicode characters (that would be discarded when converted first to a Unicode label and then back to an ASCII label), arbitrary domains can be impersonated. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libidn2 (PTS) | buster (security), buster, buster (lts) | 2.0.5-1+deb10u1 | vulnerable |
| bullseye | 2.3.0-5 | fixed |
| bookworm | 2.3.3-1 | fixed |
| sid, trixie | 2.3.7-2 | fixed |
| libidn2-0 (PTS) | jessie, jessie (lts) | 0.10-2+deb8u1 | vulnerable |
| stretch (security), stretch (lts), stretch | 0.16-1+deb9u1 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| libidn2 | source | (unstable) | 2.2.0-1 | | | |
| libidn2-0 | source | (unstable) | (unfixed) | | | |
Notes
[buster] - libidn2 <no-dsa> (Minor issue; intrusive to backport)
https://gitlab.com/libidn/libidn2/commit/241e8f486134793cb0f4a5b0e5817a97883401f5 (2.2.0)
https://gitlab.com/libidn/libidn2/merge_requests/71
Backport available: https://git.launchpad.net/ubuntu/+source/libidn2/commit/?id=0aa447342fbf0fc37d7887982e0daf817db08b1d
[stretch] - libidn2-0 <postponed> (Minor issue, intrusive to backport)
[jessie] - libidn2-0 <postponed> (Minor issue, intrusive to backport)